Liquid fuel burner



Aug. 27, 1935. R. F. BLAKE LIQUID FUEL BURNER Filed Oct. 9, 1955 2 M v' ll I Patented Aug. 27, 1935 UNITED STATES LIQUID FUEL BURNER Raymond F. Blake, Newburyport, Mass.

Application October 9, 1933, Serial No. 692,773

1 Claim.

This invention relates to fuel oil burners of the type in which the oil is usually pre-heated and delivered under pressure into a carbureting chamber in a fine jet or spray and which are primarily intended to be employed in stoves or ranges.

In certain oil burners of this type the preheating and spraying means comprise a horizontally disposed tube which is somewhat loosely insertable through an aperture in the carbureting chamber into which the nozzle at the end of the tube projects. An objection to this type of burner has been due to the fact that unconsumed oil is liable to run back from the nozzle on the surface of the tube, and to drip into the bottom of the chamber in which the burner is located, or elsewhere, this being particularly likely to occur at the time of starting the burner, or before it becomes thoroughly heated. Also, at such times, unconsumed oil is liable to accumulate within the burner and cause smoking and other objectionable results.

The objects of my invention are to provide an improved construction of burner of the type above referred to, in which means are provided for preventing back flow of liquid fuel on the outer surface of the jet nozzle and for catching the unconsumed liquid which may be discharged therefrom and also for collecting unconsumed fuel in the burner casing, so that it may be delivered to a suitable receptacle.

I accomplish these objects by means of the construction hereinafter described and illustrated in the accompanying drawing, in which the figure is a sectional view of a burner of the type referred to illustrating an embodiment of my invention.

The type of burner shown comprises a series of tubes l0 which are supported horizontally at each end in hollow castings H and are provided with burner apertures 12 at suitable intervals. A carbureting chamber I4 is mounted between the tubes l0 and is supported by an intake tube l5, which is mounted in one of the end castings II and opens into the chamber l4 opposite the discharge end of a supply, or generator tube It, which is extended horizontally through an aperture in the wall of chamber l4 and has a small aperture I! in its end through which the liquid fuel is discharged in a spray or jet, which is directed towards the middle of the entrance to tube l5. An air entrance passage l8 extends vertically downward from the bottom of the chamber 14, directly beneath the end of tube I6, so that air passing upwardly therein through its open, lower end, will be mixed with the fuel delivered through the aperture l1 and the mixture will be discharged into the tube l5 and delivered to the adjacent end casting II and the burner tubes [0, in the normal operation of the 5 burner.

According to my invention the end portion of the nozzle of the generator tube l6, which projects into the carbureting chamber, is provided with an annular groove i6 forming an annular o lip, or flange IE5" at its end, which projects vertically therefrom.

While nearly all of the liquid fuel which is discharged from the nozzle aperture ll will be delivered into the tube l5, a small portion, particularly before the tube It becomes thoroughly heated, is liable to flow down on the face of the nozzle, from which point it would tend to run back on the surface of the pipe l6 and pass outside the carbureting chamber, and then would drip therefrom at some objectionable point. This action is prevented by the lip it", from which the liquid will drip down through the air entrance passage 18. In this connection I further provide a drip cup 28 which is mounted in upright position on a nipple 2i directly beneath the entrance to the air passage [8, said nipple being supported by a pipe 22 which leads to any conveniently located receptacle, as 23, so that, when liquid drips from the lip I6", through air passage l8, it will fall into the 30 cup 26, from which point it may be conducted into the receptacle 23. Pipe 24 is arranged in open communication with the pipe 22 directly beneath the nipple 2|, said pipe 24 being extended upward and connected to the bottom of the end casting l I, into which the vaporized fuel is initially discharged, so that unconsumed liquid therein may pass down said pipe 24 into the pipe 22, and thence into receptacle 23. A pipe 25 is mounted in the bottom of the cup 20 and in continuation with the nipple 2i, and is extended upward into the air entrance passage l8, so that vapor which may be discharged from pipe 24 into pipe 22 may pass upward and be discharged into the air entering the passage l8, and may thereby be conducted again into the burner. An aperture 28 is formed in the pipe 25 adjacent the bottom of the cup 28, so that liquid which drips into the cup from the lip IE" may drain into the pipe 22 and pass into the receptacle 23. The lower end of the nipple 2|, which is located above the point where the pipe 2 3 enters the pipe 22, is preferably somewhate choked or reduced in diameter to provide a passage 39 which is of sufiicient size to permit the liquid fuel which may drip into the cup 20 topassintothereceptacle23, but which will prevent vapor from being drawn from the burner castings through pipe 24 and discharged from pipe 25 into the carbureting chamber in sufficient quantity to vary substantially the mixture which is delivered to the burner through pipe l5.

With the above described construction all the liquid fuel which is discharged from the nozzle aperture I! will eventually either be consumed or will be conducted to the receptacle 23, and will not be permitted to drip into the bottom of the chamber containing the burner, or to cause smoking on account'of partly consumed fuel. A

I claim:

A liquid fuel burner comprising a casing having a carbureting chamber provided with an air entrance passage in its bottom, a fuel nozzle extending into said chamber and having a depending drip flange adjacent v the discharge end thereof arranged directly over said passage and in position to prevent back flow of the fuel on the surface of the nozzle, a receptacle arranged to receive liquid dripping from said flange, a drain pipe leading from said receptacle, a pipe connecting the bottom of said casing and said drain pipe, and a pipe connected to said drain pipe and opening into said air entrance passage, to return vaporized H fuel thereto.

RAYMOND F. BLAKE. 

